linux-kernel - Re: [PATCH v6 2/6] pci: OF: Fix the conversion of IO ranges into IO resources.

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Message-Id: <20140307210641.11762C40DCB@trevor.secretlab.ca>
Date:	Fri, 07 Mar 2014 21:06:41 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Liviu Dudau <Liviu.Dudau@....com>,
	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tanmay Inamdar <tinamdar@....com>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 2/6] pci: OF: Fix the conversion of IO ranges into IO resources.

On Wed,  5 Mar 2014 11:48:53 +0000, Liviu Dudau <Liviu.Dudau@....com> wrote:
> The ranges property for a host bridge controller in DT describes
> the mapping between the PCI bus address and the CPU physical address.
> The resources framework however expects that the IO resources start
> at a pseudo "port" address 0 (zero) and have a maximum size of IO_SPACE_LIMIT.
> The conversion from pci ranges to resources failed to take that into account.
> 
> In the process move the function into drivers/of/address.c as it
> now depends on pci_address_to_pio() code.
> 
> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> Tested-by: Tanmay Inamdar <tinamdar@....com>

I think this is okay, but I'll need an ack from Arnd or Ben.

g.

> ---
>  drivers/of/address.c       | 34 ++++++++++++++++++++++++++++++++++
>  include/linux/of_address.h | 13 ++-----------
>  2 files changed, 36 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index d1bb30f..d595d98 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -724,3 +724,37 @@ void __iomem *of_iomap(struct device_node *np, int index)
>  	return ioremap(res.start, resource_size(&res));
>  }
>  EXPORT_SYMBOL(of_iomap);
> +
> +/**
> + * of_pci_range_to_resource - Create a resource from an of_pci_range
> + * @range:	the PCI range that describes the resource
> + * @np:		device node where the range belongs to
> + * @res:	pointer to a valid resource that will be updated to
> + *              reflect the values contained in the range.
> + * Note that if the range is an IO range, the resource will be converted
> + * using pci_address_to_pio() which can fail if it is called too early or
> + * if the range cannot be matched to any host bridge IO space (our case here).
> + * To guard against that we try to register the IO range first.
> + * If that fails we know that pci_address_to_pio() will do too.
> + */
> +void of_pci_range_to_resource(struct of_pci_range *range,
> +	struct device_node *np, struct resource *res)
> +{
> +	res->flags = range->flags;
> +	if (res->flags & IORESOURCE_IO) {
> +		unsigned long port = -1;
> +		if (!pci_register_io_range(range->cpu_addr, range->size))
> +			port = pci_address_to_pio(range->cpu_addr);
> +		if (port == (unsigned long)-1) {
> +			res->start = (resource_size_t)OF_BAD_ADDR;
> +			res->end = (resource_size_t)OF_BAD_ADDR;
> +			return;
> +		}
> +		res->start = port;
> +	} else {
> +		res->start = range->cpu_addr;
> +	}
> +	res->end = res->start + range->size - 1;
> +	res->parent = res->child = res->sibling = NULL;
> +	res->name = np->full_name;
> +}
> diff --git a/include/linux/of_address.h b/include/linux/of_address.h
> index 40c418d..3fe500a 100644
> --- a/include/linux/of_address.h
> +++ b/include/linux/of_address.h
> @@ -23,17 +23,8 @@ struct of_pci_range {
>  #define for_each_of_pci_range(parser, range) \
>  	for (; of_pci_range_parser_one(parser, range);)
>  
> -static inline void of_pci_range_to_resource(struct of_pci_range *range,
> -					    struct device_node *np,
> -					    struct resource *res)
> -{
> -	res->flags = range->flags;
> -	res->start = range->cpu_addr;
> -	res->end = range->cpu_addr + range->size - 1;
> -	res->parent = res->child = res->sibling = NULL;
> -	res->name = np->full_name;
> -}
> -
> +extern void of_pci_range_to_resource(struct of_pci_range *range,
> +		struct device_node *np, struct resource *res);
>  /* Translate a DMA address from device space to CPU space */
>  extern u64 of_translate_dma_address(struct device_node *dev,
>  				    const __be32 *in_addr);
> -- 
> 1.9.0
> 
> 
> _______________________________________________
> linaro-kernel mailing list
> linaro-kernel@...ts.linaro.org
> http://lists.linaro.org/mailman/listinfo/linaro-kernel

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